librdkafka v1.0.1 release

v1.0.1 is a maintenance release with the following fixes:

• Fix consumer stall when broker connection goes down (issue #2266 introduced in v1.0.0)
• Fix AdminAPI memory leak when broker does not support request (@souradeep100, #2314)
• Update/fix protocol error response codes (@benesch)
• Treat ECONNRESET as standard Disconnects (#2291)